47. ____ in thought, he didn’t notice me when I came into his room.

48. Please _____ tomorrow, my number is 8855463.

49. You must go there at once because the situation       prompt action.

50. A doctor was___________when Mother fell ill.

52. Don’t worry. Your child is old enough to___________himself.

53. She_______most of the prizes for swimming.

54. Extensive tests have been       on the patient.

55. I can’t see John anywhere. Where _____ he have gone?

56. The shopkeeper _____ the tramp(流浪汉) stealing sweets from the new supermarket and _____ him.

57. Yesterday I was       in the rain on my way back home, and I got a bad could and coughed very badly.